Question

a beam of electrons travels at right angles of a speed uniform magnetic field in a force of 6.4x10^-4 N. how much current does the beam carry over a 145cm long wire? 9.0x10^-6 m/s througha 4.0x10^-2 T

Answer 1

Apply Ampere's formula:

$$I=\dfrac{F}{BL}=0.011\text{ A}.$$